66 MAPS AND MAP-MAKING

points on this route by latitude and longitude. Now locate these on an outline map
of the world, and draw the route. Do the same for the following routes: (a) San-
tiago, Chile, to Auckland, New Zealand; (b) London to Panama; (c) Capetown
to Boston. Write out your conclusions as to great circle sailing.

3. In A65 the figures in states show the percentage of the occupied persons en-
gaged in manufacturing in each state in 1930. Lines have been drawn and appro-
priate shading has been added to distinguish the areas having the following per-
centages: (a) over 32, (b} 32 to 24, (c) 24 to i6s (d) 16 to 8, and (<?) under 8.

A. From the World Almanac or some other source, procure similar figures show-
ing the density of population per square mile, and insert them on two outline maps.
On one map add shading like that of A65, but let state boundaries determine the
limits of each type of shading. On the other, draw smooth lines, or "isopleths," like
those of A65, and then shade.

B. Discuss the relative merits and defects of the two maps thus drawn. Which
gives a. truer idea and why?

C. Compare A65 with your own map, and state what connection you see between
the two.

4. Try to make a map of a yard or other small area by triangulation, using a.
ruler instead of a telescope in order to get the direction from one point to another.